Quote:
Originally Posted by gsxr
I'm not that familiar with the OM617 engine, but I'd lean towards something fishy on the head before condemning the bottom end. It could be piston or ring related, but it will be bery hard to tell without pulling the head. I think you'll have to yank the head to start with, have it checked out, and go from there.
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Dave, thanks a bunch for the input. Brian, you too. An expert I am not, and I didn't even stay in a Holiday Inn Express last night ;-), but I have two strong feelings: 1, that my poor compression is due to valves, and 2 it's probably because of the PO driving around with the timing chain way out of spec. Wish I had just done the head when I did the timing chain. Oh well.
If a head rebuild likely eliminates my smoking problem, then I'm tempted to do it. I can do all the labor and wouldn't mind putting $900 in for the complete job including prechambers.
Does a head rebuild, from what you've seen in your experience, usually help out all the compression numbers? I'd love to see all the pots above 300.
What's funny is that the car will start down to about 25f w/out plugging in and it idles great on Diesel with Cetane 45 (does get a little rough with the Cetaine 40)--no nailing that I can detect, but again not an expert on detecting noises.
Thanks again, guys.